Multiple choice general knowledge science & technology

Which of the following rays are used for the detection of counterfeit currency and forgery in document

  1. Alpha rays

  2. Ultra violet rays

  3. Beta rays

  4. Light rays
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ultraviolet (UV) rays are used to detect counterfeit currency because many security features fluoresce or become visible only under UV light. These include security threads, watermarks, and invisible ink markings. Alpha and Beta rays are nuclear radiation, and ordinary light rays cannot reveal these hidden security features.

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